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The LO2 frequency used to track a spectral line at a given frequency Frest centered in the IF band (350 ) is

(6) 
and, from eq. (5), the image rest frequency at the band center is

(7) 
A little algebra follows
cm and result in

(8) 
This result is not independent of the Doppler effect. Accordingly, it the
doppler tracking is not exact for the image frequency. and for 2 different
values, and , corresponding to different velocities and ,
we obtain (assuming no change of )

(9) 
or, assuming and , and with , , the frequency
shift in MHz is

(10) 
or, in velocity (in km.s)

(11) 
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20180925